Abstract: In order to improve the efficiency of the storage resource of wireless sensor networks, enhance security at the same time, this paper proposed a hierarchical key management based on matrix space. This scheme uses sub-space of LU matrix for successive key predistribution and uses removal mechanism to reduce some of the information of matrix of nodes after key establishment. Figures of simulation show that the proposed scheme provides better storage efficiency and better security through the removal mechanism. The security of network can up to 100% in the end.

Key words: Wireless sensor network,Key management,Matrix space,Removal mechanism